code: def test_label():
      s = Sankey(flows=[0.25], labels=["First"], orientations=[-1])
      assert s.diagrams[0].texts[0].get_text() == "First\n0.25"
  
file_path: matplotlib/lib/matplotlib/tests/test_sankey.py
imports: import pytest
  from numpy.testing import assert_allclose, assert_array_equal
  from matplotlib.sankey import Sankey
  from matplotlib.testing.decorators import check_figures_equal
label_desc: Use image node_id 2 for calling a global function with example usage: test_label() without return types